Recently, many farmers have reported that tomatoes in greenhouses have just begun to bloom. However, the epidermis on the base of the plants is blackened and rotted, and the upper leaves also turn yellow and wilting. According to the description of the situation, it should belong to the stem rot of tomato, and the symptoms and control measures of the base rot are introduced.
First, the symptoms of damage. Mainly injurious to large seedlings or tomato seedlings after planting, leading to the onset of stem base or underground main and lateral roots of tomato. The disease was dark brown at the beginning. After the lesions spread, they rotted around the base of the stem and the roots and then rotted into the cortex. The aboveground leaves turned yellow. The branches and leaves of the plants gradually wilted and died from the bottom. Careful observation shows that spider silky mycelium is present in the diseased part, and dark brown sclerotia of different sizes can be formed at a later stage.
Second, the pathogen and disease conditions. It is a soil-borne disease that pathogenic bacteria overwinter in the soil or in the body with mycelia or sclerotia. The rhizomes or stems of the plants come into contact with the soil and hyphae, and they begin to invade. The field is mainly transmitted by contact, or spread by spreading farm implements, composts, etc., and seeds can also be carried. In addition, improper field management, excessive soil moisture, or high and low soil temperatures, and weak plant growth are all conducive to disease.
Third, prevention and control technology. 1. The nursery bed of tomatoes should be disinfected. The soil can be treated with soil bacteria, chlorpromazine or carbendazim. 2. Greenhouse cultivation Tomato cultivation should be ridiculed. The base fertilizer used must be decomposed. 3. We must pay attention to irrigation technology and increase dehumidification in greenhouse management. Specifically speaking, the irrigation of tomatoes in winter must be under the film water irrigation in sunny days, and timely drainage after irrigation, reducing the air humidity in the field. 4. Serious diseased plants should be removed individually and chemical control should be carried out in time. Can choose to use 70% of ketamine WP 400 times, 50% carbendazim WP 500 times, 50% acetaminophen WP 1000 times, even spray irrigation. That is, the whole plant is sprayed and sprayed around the base of the stem. In addition, the base of the stalk can also be applied with the above agents, and the concentration of the applied stalk is greater than that of the spray. 5. Diseased plants must be taken out of the field and destroyed after being removed.
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